Matrix help

I just picked up Nyx matrix #189, it was in need of a good cleaning and I have started that project. My question comes in at the next step, it has the origanal board in it and when I put a new battery in it won't turn on. I think it needs a new connection. I can put a new connector in but I want the opinions of the gurus before I went forward. What would your first steps be?

I just picked up Nyx matrix #189, it was in need of a good cleaning and I have started that project. My question comes in at the next step, it has the origanal board in it and when I put a new battery in it won't turn on. I think it needs a new connection. I can put a new connector in but I want the opinions of the gurus before I went forward. What would your first steps be?

Check and make sure one of the wires on your 9v connector hasn't came un-soldered at the battery connector end, and also make sure they haven't came lose in the board connection end. If all appears fine, then you have a board issue.